(15a) 



Table II. 

 Coefficients of coi-r-elation for the population 



Parental correlation. Grandpar. correlation, 

 Character. (1040 ind . ) (997 ind.) 



Spine number, .806 ± .007 .785 ± .008 



Shell size. .903 ± .004 .773 ± .008 



Shell form. .107 ± .022 .019 i .021 



Mouth size. .732 ± .010 .677 ± .011 



Mouth form. .142 ± .021 .098 ± .021 



